NW | 25-ITP-Sep | Ahmad Hmedan | Sprint 2 | Book Library

debugging/book-library/script.js

@@ -5,8 +5,9 @@ window.addEventListener("load", function (e) {
   render();
 });
 
+//just one thing need to check 
 function populateStorage() {
-  if (myLibrary.length == 0) {
+  if (myLibrary.length === 0) {   //why there is just == not ===
     let book1 = new Book("Robison Crusoe", "Daniel Defoe", "252", true);
     let book2 = new Book(
       "The Old Man and the Sea",
@@ -28,17 +29,14 @@ const check = document.getElementById("check");
 //check the right input from forms and if its ok -> add the new book (object in array)
 //via Book function and start render function
 function submit() {
-  if (
-    title.value == null ||
-    title.value == "" ||
-    pages.value == null ||
-    pages.value == ""
-  ) {
+  //if any of the information is missing show an alert
+  if (!title.value || !author.value || !pages.value) {
     alert("Please fill all fields!");
+
     return false;
   } else {
-    let book = new Book(title.value, title.value, pages.value, check.checked);
-    library.push(book);
+    let book = new Book(title.value, author.value, pages.value, check.checked);
+    myLibrary.push(book);
     render();
   }
 }
@@ -54,29 +52,29 @@ function render() {
   let table = document.getElementById("display");
   let rowsNumber = table.rows.length;
   //delete old table
-  for (let n = rowsNumber - 1; n > 0; n-- {
+  for (let n = rowsNumber - 1; n > 0; n--) {
     table.deleteRow(n);
   }
   //insert updated row and cells
   let length = myLibrary.length;
   for (let i = 0; i < length; i++) {
-    let row = table.insertRow(1);
-    let titleCell = row.insertCell(0);
+    let row = table.insertRow(1);    // why (1) not i+1 insert <tr> with four <td>
+    let titleCell = row.insertCell(0);   // the table.rows and row.cells are HTMLCollection,not a real array, but they behave like array(indexed,length) . they are DOM collections
     let authorCell = row.insertCell(1);
     let pagesCell = row.insertCell(2);
     let wasReadCell = row.insertCell(3);
-    let deleteCell = row.insertCell(4);
-    titleCell.innerHTML = myLibrary[i].title;
+    let deleteCell = row.insertCell(4);          // it is like insert for <td> </td> 
+    titleCell.innerHTML = myLibrary[i].title;    //filling the cells    why innerHTML
     authorCell.innerHTML = myLibrary[i].author;
     pagesCell.innerHTML = myLibrary[i].pages;
 
     //add and wait for action for read/unread button
     let changeBut = document.createElement("button");
-    changeBut.id = i;
+    changeBut.id = i;                            // give the button the index of the book object
     changeBut.className = "btn btn-success";
     wasReadCell.appendChild(changeBut);
     let readStatus = "";
-    if (myLibrary[i].check == false) {
+    if (myLibrary[i].check === true) {
       readStatus = "Yes";
     } else {
       readStatus = "No";
@@ -88,16 +86,19 @@ function render() {
       render();
     });
 
-    //add delete button to every row and render again
+    //add delete button to every row and render again 
+
     let delButton = document.createElement("button");
-    delBut.id = i + 5;
-    deleteCell.appendChild(delBut);
-    delBut.className = "btn btn-warning";
-    delBut.innerHTML = "Delete";
-    delBut.addEventListener("clicks", function () {
+    delButton.id = i + 5;
+    deleteCell.appendChild(delButton);
+    delButton.className = "btn btn-warning";
+    delButton.innerHTML = "Delete";
+    delButton.addEventListener("click", function () {    // 
       alert(`You've deleted title: ${myLibrary[i].title}`);
       myLibrary.splice(i, 1);
       render();
+
     });
   }
 }
+